Coupling for sewing-machines



PATENTED JAN. 12, 1904.

, N J. M. JAoxso COUPLING FOR SEWING MACHINES.

APILIOATION FILED 00T.2, 1903.

N0 MODEL.

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yszs 1 6% UNITED STATES Patented January 12, 1904.

JAMES M. JACKSON, OF CANNON, TEXAS.

COUPLING FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 749,295, dated January12, 1904.

Application filed'October 2,1903.

10 aZZ whom it may concern:

Be it known that L'JAMES M. JAoKsoN,'a citizen of the United States,residing at Cannon, in the county of Grayson and State of Texas, haveinvented a new and useful Coupling for Sewing-Machines, of which thefollowing is a specification.

This invention relates to devices employed for the purpose of preventingshafts from be- 1 ing rotated backward, and is more particularlyapplicable to sewing-machines to prevent them running backward andbreaking the thread, and has for its object to simplify and improvedevices of this character.

The invention consists incertain novel features of construction, ashereinafter shown and described, and specified in the claims.

In the drawings illustrative of the invention, in which correspondingparts are denoted by like designating characters, Figure 1 is a sideelevation of a portion of a sewing-machine with the improvement applied.Fig. 2 is an enlarged sectional detail of the same. Fig. 3 is atransverse section on the line 3 3 of Fig. 2. Fig. 4 is a perspectiveView of the coupling-sleeve detached.

The improved device may be applied to any suitable part of the drivingmechanism of a sewing-machine, but will preferably be applied to themain drive-wheel and its shaft, and for the purpose of illustration itis shown thus applied, representing the table supported upon the frame11 and carrying the usual head 12 for the mechanism above the table andwith the usual belt-pulley 13.

The main drive-pulley is represented at 14 and mounted rigidly upon ashaft-section 15, supported for rotation in the frame 11.

Extending from theframe 11 is a bracket 16, supporting ashaft-section 17in longitudinal alinement with the shaft-section and one sectionpreferably with a stud 18 engaging a recess or.socket, in the adjacentend of the other shaft-section, as shown. The shaftsections are thusindependently rotative in their bearings.

Serial No. 175,517. (No model.)

is provided with a crank-wheel 20, to which the usual pitman 21 isapplied, as shown in Fig. 1.

Slidably disposed upon the shaft-sections 15 17 is a sleeve or collar22, extending for a considerable distance over the adjacent portions ofeach section and forming a shield and support for the jointbetweenthern, as shown.

The sleeve 22 is provided with one or more elongated longitudinalapertures 23, through which pins 24c extend from the shaft-section sideinclined and adapted to'engage projections 26 on the shaft-section 17.

A spring 27 is disposed on the shaft-section 15, bearing against thesleeve 22 and maintaining it yieldably in engagement with theprojections 26.

As many of the apertures 23 and pins 24 and recesses 25 and projections26 may be used as required; but generally sets of each, as shown, willbe sufiicient.

When thus constructed, it will be obvious that when motion is impartedto the crank- Wheel 20 in a forward direction the projections 26 willengage the straight sides of the re cesses 25 and carry the sleeve 22with it, which in turn will carry the shaft-section 15 by the action ofthe pins 24: in the slots 23, the sleeve being kept up to its work bythe spring 27. When, however, the motion of the crankwheel is reversed,the projections 26 will run over the inclined sides of the cavities 25and move the sleeve longitudinally of the shaft-sections by compressingthe spring 27, but without rotating the shaftsection 15. By this simplearrangement when the drivecrank wheel 20 and its connected drive-shaftsection 17 are rotated forwardly they will pick-up and carry the drivenshaft-section 15 and its attached pulley with it, and when the motion isreversed the projections 26 will merely click over the recesses 25 andnot rotate the drive-pulley. Thus when attached ing the thread byrunning the machine back- Ward, as with a sewing-machine thus equippedit is impossible to run the machine backward.

The elongated sleeve 22, extending over and closely engaging theadjacent ends of the shaft-sections 15 17 performs the twofold functionof a means whereby the motion is transmitted from the shaft-section 17to the shaft-section 15, but also as a support and shield to theabutting ends of the two sections and materially assist the frame 11 andbracket 16 to support them.

Having thus described the invention, What I claim is 1. In a device ofthe character described, a shaft in two sections mounted in longitudinalalinement for independent rotation, a sleeve slidable upon said shaftand rotative With one of said sections and provided with one or morecavities in one end inclined upon one side, projections carried by oneof said shaftsections for engagement with said cavities, a springbearing against said sleeve and maintaining it yieldably in engagementwith said projections, means for applying motion to one of saidshaft-sections, and means for transmitting motion from the other of saidshaftsections, whereby motion will be imparted to said driven sectiononly when the driving-section is rotated in one direction, substantiallyas described.

2. In a device of the character described, a

supporting-frame, a shaft in two sections and mounted in longitudinalalinement for inde pendent rotation in said frame, a sleeve carr1ed bysaid shaft-sections and having one or more longitudinal apertures andwith one or more recesses in one end inclined on one side, pins carriedby one of said shaft-sections and extending through said apertures,projections carried by the other of said shaftsections for engagementwith said recesses, a driving-pulley carried by one of saidshaft-sections and having a spring thereon between said driving-pulleyand sleeve, means for applying motion to one of said shaft-sections, andmeans for transmitting motion from the other of said shaft-sections,substantially as described.

3. In a device of the character described, a supporting-frame, a shaftin two sections and mounted in longitudinal alinement in said frame forindependent rotation, a sleeve carried by said shaft-sections andslidable thereon and forming a support for their adjacent ends andprovided with one or more longitudinal apertures and with one or morerecesses in one end with one inclined side, pins extending from one ofsaid shaft-sections through said aperture, projections carried by theother of said shaft-sections for engagement with said recesses, and aspring bearing against said sleeve and maintaining it yieldably inengagement with said projections, substantially as described.

In testimony that I claim the foregoing as my own Ihave hereto affixedmy signature in the presence of two witnesses.

JAMES M. JACKSON.

Witnesses:

J. L. DYER, R. K. HARRIS.

